Replace only first occurrence of data: in response

api/responder.py

@@ -151,7 +151,7 @@ async def respond(
                             chunk = chunk.decode('utf8').strip()
 
                             if 'azure' in provider_name:
-                                chunk = chunk.strip().replace('data: ', '')
+                                chunk = chunk.strip().replace('data: ', '', 1)
 
                                 if not chunk or 'prompt_filter_results' in chunk:
                                     continue

checks/client.py

@@ -100,7 +100,7 @@ async def test_chat_stream_gpt3() -> float:
 
     async for chunk in response.aiter_text():
         for subchunk in chunk.split('\n\n'):
-            chunk = subchunk.replace('data: ', '').strip()
+            chunk = subchunk.replace('data: ', '', 1).strip()
 
             if chunk == '[DONE]':
                 break